Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0136883875646b…

MALICIOUS

PDF

90.1 KB Created: 2021-07-20 11:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ad2626b022cbb5cb25cabf7b8a7e092 SHA-1: 1d00dbd9f0cbb43e9ae4dc0013583c8b2f3a8cb0 SHA-256: fd0136883875646b41bce17418cb9ab506ed43eda70afd4b513356816eb295d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it serves primarily as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/98390602429.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160907ce93b496---23478499969.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a43895bc2ea---20885301242.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/wiraxuxugetugagujesa.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/14803223211.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/3387dd55513b0c612225074820241e5e/50697775467.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/91650475038.pdfIn PDF document text
    • https://ka-base.no/images_content/file/99959639758.pdfIn PDF document text
    • http://accronline.com/userfiles/file/dolufiforevapilipomuboja.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/farugizogukad.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d46aedb00---pugapinigox.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/612e95b3673ea3718d6a337037ecab19/woxumijovar.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/83954427159.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092185a42f3e---zuresamupowufe.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/kedudaxofazuj.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160712250a2a96---75977015527.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ob5de4jibv20m2j18b1ulg1ke4/zazevenuxafeda.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/87708807415.pdfIn PDF document text
    • https://amblamy.ee/upload/file/50569295575.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/jejisifajew.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/67354109476.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/b1be4443234e96a659f99bfc517dab7c/fufisapi.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/25214931422.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/35092337932.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/91141268111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=limp+leaves+on+christmas+cactusPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 10764 bytes
SHA-256: 50ecedeee11b67963a1fa0370f5cff1050561e34318c09d2ec2025dd7987681a
font_01_sfnt_off000116b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B3 17364 bytes
SHA-256: 4ec99a4053135c507097d7041c26567f30bc2f277d48b47bbf272e02f284cb0e
font_02_sfnt_off000142f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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